The infrared and Raman spectra of polycrystalline samples of K2HAsCr2O10 were recorded and an assignment for the complete vibrational spectrum is proposed. The thermal behaviour of the compound has also been investigated by means of TG- and DTA-methods. The spectral and thermal characteristics of the substance resemble that of K2HPCr2O10, although some differences have been found and explained.Facultad de Ciencias Exactas